Lighting unit



R. F. LESTER LIGHTING UNIT Dec. 23, 1958 2 Sheets-Sheet 1 Filed Feb. 18,1957 9 m m w 1L. A

E Q R Dec. 23, 1958 Filed Feb. 18, 1957 R. F. LESTER LIGHTING UNIT 2Sheets-Sheet 2 INVENTOR.

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United States Patent LIGHTING UNIT Ray F. Lester, Syracuse, N. Y.,assignor to Crouse-Hinds Company, Syracuse, N. Y., a corporation of NewYork Application February 18, 1957, Serial No. 640,815

2 Claims. (Cl. 240-112) This invention relates to industrial type vaporproof lighting units.

It is an object of this invention to provide a lighting unit wherein thereflecting shade is detachably secured to the lighting unit by ayieldable member economical to manufacture and which functions toeffectively hold the shade to the unit during the relamping thereof.

The invention consists of the novel features and in the combinations andconstructions hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanyingdrawings in which like characters designate corresponding parts in allthe views.

In the drawings Figure l is a cross section of the lighting unit.

Figure 2 is a cross section taken on line 2-2 of Figure 1.

Figure 3 is an enlarged detail view of the shade mounting means.

The lighting unit is composed of a canopy having a hub threaded at 11 atits upper end for the reception of a wire carrying conduit (not shown).The canopy is circular and couically shaped, and has a contact block 13with contacts which engage the contacts of the receptacle 15 to form thenecessary electrical connections to light the lamp 16, shown in hiddenlines. The canopy is formed with an internal thread and has a flange 21depending from the lower end of the canopy, which flange has an internalbead 25 for a purpose hereinafter described. Threadedly received in thecanopy is a fitting 30. The fitting has an offset upstanding externallythreaded annular flange 31 which is threaded into the canopy 10, and alower depending annular flange 32 which is internally threaded for thereception of a complementally threaded globe 35. A ledge 36 is formed bythe offset upstanding flange 31, and a gasket 37 is mounted on the ledgefor a purpose hereinafter described. The fitting has a globe guard 40mounted on the external surface of the depending flange 32. The globeguard has a hingedly mounted keeper 41 on its lower end, with a pair ofspring-like holders 42 for holding the globe when the keeper is latched,as at 45, to the lower end of the globe guard.

A reflecting shade 50 has an inwardly extending portion 51 mounted onthe ledge 36 above the gasket 37. Another gasket 52 is mounted on theupper surface of the inwardly extending portion 51, the gaskets 37 and52 acting in conjunction to hold the lamp shade 50 in the canopy, and toform a vapor tight joint between the fitting 30 and the canopy 10.

As will be seen from Figure 1, the depending flange 21 on the canopy isconcentrically spaced from the upstanding flange 31 on the fitting 30,forming an annular space 60. An upstanding annular flange 65 on theshade 2,866,084 Patented Dec. 23, 1958 ice is received in said space 60.The flange 65 has an outwardly crimped portion 66. Received in the spacebetween the internal bead 25 on the canopy, and the outwardly crimpededge 66 on the shade, is a coil spring 70, as will be seen in Figure 2.This coil spring acts to retain the shade 50 in the canopy 10 when thefitting 30 is removed from the canopy. When the fitting is removed fromthe canopy, it is merely necessary, should it be desired to remove theshade 50, to pull downwardly on the shade 50. This will exert a force onthe coil spring 70 and tend to compress the individual coils of thespring into an elongated shape in order to allow the outwardly crimpedportion 66 of the shade to pass by the internal head 25 of the canopyand out of the canopy 10. To insert the shade in the canopy, it is onlynecessary to push the shade into the canopy with enough force toovercome the coil spring 70 to compress the spring in order to allow thecrimped rim 66 to slide over the coil spring.

in practice, it has been found that this method of yieldably retainingthe shade in the canopy of the lighting unit is far more beneficial anddesirable than pre-existing methods, since although the coil spring maybe deformed, it has an elastic deformity-that is, it will not bepermanently deformed from the compression on the spring from the shade50. With pre-existing retainers made of rubber or the like, which wereto be deformed in order to remove the reflecting shade, it oftenoccurred that the retainers became permanently deformed after a certainamount of use, so that it became difficult to insert and remove theshade holder in the unit. Also, heat generated in the lighting unitoften caused the rubber retainer to vulcanize to the parts, preventingremoval of the shade. It will thus be seen that my construction obviatesthese difiiculties.

What I claim is:

1. A lighting unit comprising a cylindrical canopy ter minating in adepending annular flange formed at its lower edge with an internal head,a globe fitting detachably secured to said canopy and having a radialledge confronting the under surface of said annular flange, said ledgeterminating in an upstanding cylindrical flange .spaced radiallyinwardly from said annular flange and said head, a reflecting shadehaving a radial portion and an upstanding cylindrical portion, saidcylindrical portion adapted for insertion in the space between saidcylindrical flange of the globe fitting and said depending canopyflange, said radial portion adapted to be clamped between said ledge andsaid annular flange, the upper edge of the cylindrical portion of saidshade being bent outwardly toward said canopy flange and being spacedinwardly and upwardly from said head, an annular metallic retainingmember encircling said cylindrical portion of the shade intermediate theoutwardly bent edge thereof and said bead and yieldingly engaging saidcanopy flange, said retaining member being compressible in a radialdirection.

2. A lighting unit, as set forth in claim 1, wherein said annularmetallic retaining member consists of a multicoil spring.

References Cited in the file of this patent UNITED STATES PATENTS803,883 Dale Nov. 7, 1905 998,971 Legge July 25, 1911 1,027,848 HustonMay 28, 1912 2,574,882 McDowell Nov. 13, 1951

